PARASITIC WORMS— LEIPER AND ATKINSON. 



33 



way along its Length. These lemnisci are sometimes contracted, bu1 their normal 

 length appears to be about the same as that of the proboscis. The females are tilled 

 with eggs. The genital tube, as characteristically illustrated in text-fig. 3, is visible as 

 a rule. 



12. Echinorhynchus dchnilidnu, Leip. and Atk. (PI. II, tig. 14. Text-fig. 4.) 



EcMnorliynchus clebenhami, Leiper and Atkinson, Proc. Zool. Sac, 1914, p. 223. 



Male 2 - 2 nun. long. Female 2 ■ 2 mm. Sickle-shaped. Stout, cylindrical rostellum with hooks in 

 12 linear series of 6 each. Lemnisci bag-like, extending but little behind proboscis. Testes large, 

 occupying anterior half of body-cavity, deeply lotted. Keinale 

 crowded with eggs. 



Host. — A number of very small but sexually 

 mature and egg-bearing Echinorhynchi, of this 

 species, were found in Trematomus bernacchii, in 

 association with the preceding forms. 



Parasite. — Male 2 * 2 mm. long. Female 2 ' 2 mm. 

 All the specimens are sickle-shaped, the dorsal aspect 

 being convex. The rostellum is cylindrical and 

 relatively stout. It bears twelve linear rows of six 

 spines each. The proboscis (PI. II, fig. L 4, a) measures 

 0 ' 24 mm. in length, and is 0"14mm. in diameter; 

 the portion anterior to the attachment of the in- 

 vagination of the body-wall being twice the length 

 of thai which protrudes posteriorly into the body- 

 cavity. The lemnisci (Fig. 14, 1,1') are. bag-like and 

 extend only a slight distance beyond the internal 

 end of the proboscis. In the male there are two 

 large testes (Fig. 14, d, d') occupying the anterior 

 half of the body-cavity and reaching the posterior 

 end id' the proboscis. The testes are constricted in 

 such a wav as to give the impression that there are I 

 actually four separate testicular masses ; the)" measure 

 0"2mm. by 0*1 mm. There are present in this 



he 



Mm 



1 1<; 



■J 



4. — ■ EcMnorliynchus debenhami : 

 Female, showing cell-masses (c) 

 which eventually form eggs, free 

 in the body-cavity. 



form, as in E. remiieki, cuticular lapels upon 

 rostellum protecting the hooks; but they are not nearly so well developed. The eggs 

 measure 0" 0(15 mm. in length. Some of the specimens were filled with cell-masses 

 from which the eggs ultimately develop (text-fig. 4, e). 



